"We have increased the potency of the Strength of Wrynn and Hellscream’s Warsong buffs in Icecrown Citadel by an additional 5%. These buffs now increase total health, healing done and damage dealt by 20%. In addition, the number of attempts allotted for all final bosses on Heroic difficulty has been increased to 50."

So yeh, headed into ICC this morning to pick up a pattern and noticed it was still 15%, is this a bug or a tool tip error?